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  3. March 2006

Re: JVM on i-Series

There is a startup cost every time you fire up the JVM. Using a never-ending-program (NEP) job is a good solution, IMO. A service program won't do what you think, as far as I know, because that will still be run separately in each job.
Threads in pools are sort of like what we used to think of as jobs. Esp. when talking about max active - this is threads, not jobs as such. Have you looked at the Work Management book lately?
You might go to www.iseries.ibm.com/support and click on the Search button. Then search on JVM and performance or some such - I know there are some articles from IBM on making the JVM perform better, generally speaking.
There is also a site www.iseries.ibm.com/perfmgmt that might have something - I looked but did not find much right away - there is a tool there called PTDV that is good for analyzing Java performance data. 

HTH
Vern

At 03:17 AM 3/14/2006, you wrote:


Hi all,

do any of you have experience with java on the iSeries?

Currently I'm confronted with Java calls from done by an ILE program.
For each interactive session, a JVM is started with 20 threads. This
results in a regular load of 400 to 600 JVM's, which creates an
enormous load on the machine both in memory and in CPU load.

I would think along the lines of a serviceprogram which maintains 1
JVM, which is used by interactive sessions by means of dataq or
something like that.

Secondly.........can anyone direct me to some documentation which
specifically covers the subject of the JVM on iSeries? I would like to
read more on how to balance max act threads defined in the pool versus
number of JVM's etc.

TIA
Sacha

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